Buggy code:
class ModelControllerImpl implements ModelController { private final ServiceRegistry serviceRegistry ; private final ServiceTarget serviceTarget ; private final ManagementResourceRegistration rootRegistration ; private final ModelControllerLock controllerLock = new ModelControllerLock ( ) ; private final ContainerStateMonitor stateMonitor ; private final ModelControllerImpl . RootResource model = new ModelControllerImpl . RootResource ( ) ; private final ConfigurationPersister persister ; private final ProcessType processType ; private final RunningModeControl runningModeControl ; private final AtomicBoolean bootingFlag = new AtomicBoolean ( true ) ; private final OperationStepHandler prepareStep ; private final ControlledProcessState processState ; private final ExecutorService executorService ; private final ExpressionResolver expressionResolver ; private final ConcurrentMap < Integer , OperationContext > activeOperations = new ConcurrentHashMap < > ( ) ; ModelControllerImpl ( final ServiceRegistry serviceRegistry , final ServiceTarget serviceTarget , final ManagementResourceRegistration rootRegistration , final ContainerStateMonitor stateMonitor , final ConfigurationPersister persister , final ProcessType processType , final RunningModeControl runningModeControl , final OperationStepHandler prepareStep , final ControlledProcessState processState , final ExecutorService executorService , final ExpressionResolver expressionResolver ) { } public ModelNode execute ( final ModelNode operation , final OperationMessageHandler handler , final OperationTransactionControl control , final OperationAttachments attachments ) { } protected ModelNode executeReadOnlyOperation ( final ModelNode operation , final OperationMessageHandler handler , final OperationTransactionControl control , final OperationAttachments attachments , final OperationStepHandler prepareStep , final int operationId ) { final SecurityManager sm = System . getSecurityManager ( ) ; if ( sm != null ) { sm . checkPermission ( ACCESS_PERMISSION ) ; } final OperationContext delegateContext = activeOperations . get ( operationId ) ; if ( delegateContext == null ) { <START_BUG> throw new IllegalStateException ( ( "no<seq2seq4repair_space>context<seq2seq4repair_space>to<seq2seq4repair_space>delegate<seq2seq4repair_space>with<seq2seq4repair_space>id:<seq2seq4repair_space>" + operationId ) ) ; <END_BUG> } final ModelNode response = new ModelNode ( ) ; final OperationTransactionControl originalResultTxControl = ( control == null ) ? null : new OperationTransactionControl ( ) { @ Override public void operationPrepared ( OperationTransaction transaction , ModelNode result ) { control . operationPrepared ( transaction , response ) ; } } ; final ReadOnlyContext context = new ReadOnlyContext ( processType , runningModeControl . getRunningMode ( ) , originalResultTxControl , processState , false , delegateContext , this , operationId ) ; context . addStep ( response , operation , prepareStep , MODEL ) ; CurrentOperationIdHolder . setCurrentOperationID ( operationId ) ; try { context . executeOperation ( ) ; } finally { CurrentOperationIdHolder . setCurrentOperationID ( null ) ; } if ( ( ! ( response . hasDefined ( RESPONSE_HEADERS ) ) ) || ( ! ( response . get ( RESPONSE_HEADERS ) . hasDefined ( PROCESS_STATE ) ) ) ) { ControlledProcessState . State state = processState . getState ( ) ; switch ( state ) { case RELOAD_REQUIRED : case RESTART_REQUIRED : response . get ( RESPONSE_HEADERS , PROCESS_STATE ) . set ( state . toString ( ) ) ; break ; default : break ; } } return response ; } protected ModelNode internalExecute ( final ModelNode operation , final OperationMessageHandler handler , final OperationTransactionControl control , final OperationAttachments attachments , final OperationStepHandler prepareStep , final boolean attemptLock ) { } boolean boot ( final List < ModelNode > bootList , final OperationMessageHandler handler , final OperationTransactionControl control , final boolean rollbackOnRuntimeFailure ) { } private List < ParsedBootOp > organizeBootOperations ( List < ModelNode > bootList , OperationContextImpl context , final int lockPermit ) { } void finishBoot ( ) { } public Resource getRootResource ( ) { } ManagementResourceRegistration getRootRegistration ( ) { } public ModelControllerClient createClient ( final Executor executor ) { } PersistenceResource writeModel ( final Resource resource , Set < PathAddress > affectedAddresses ) throws ConfigurationPersistenceException { } void acquireLock ( Integer permit , final boolean interruptibly , OperationContext context ) throws InterruptedException { } void releaseLock ( Integer permit ) { } void acquireContainerMonitor ( ) { } void releaseContainerMonitor ( ) { } void awaitContainerMonitor ( final boolean interruptibly ) throws InterruptedException { } ContainerStateChangeReport awaitContainerStateChangeReport ( ) throws InterruptedException { } ServiceRegistry getServiceRegistry ( ) { } ServiceTarget getServiceTarget ( ) { } ModelNode resolveExpressions ( ModelNode node ) throws OperationFailedException { } private void logNoHandler ( ParsedBootOp parsedOp ) { } private class DefaultPrepareStepHandler implements OperationStepHandler { @ Override public void execute ( OperationContext context , ModelNode operation ) throws OperationFailedException { } } private final class RootResource implements Resource { private final AtomicReference < Resource > modelReference = new AtomicReference < Resource > ( Factory . create ( ) ) ; void set ( Resource resource ) { } @ SuppressWarnings ( { "CloneDoesntCallSuperClone" } ) @ Override public Resource clone ( ) { } public Resource getChild ( PathElement element ) { } public Set < Resource . ResourceEntry > getChildren ( String childType ) { } public Set < String > getChildrenNames ( String childType ) { } public Set < String > getChildTypes ( ) { } public ModelNode getModel ( ) { } public boolean hasChild ( PathElement element ) { } public boolean hasChildren ( String childType ) { } public boolean isModelDefined ( ) { } public boolean isProxy ( ) { } public boolean isRuntime ( ) { } public Resource navigate ( PathAddress address ) { } public void registerChild ( PathElement address , Resource resource ) { } public Resource removeChild ( PathElement address ) { } public Resource requireChild ( PathElement element ) { } public void writeModel ( ModelNode newModel ) { } private Resource getDelegate ( ) { } } }

Fix:
throw ControllerMessages . MESSAGES . noContextToDelegateTo ( operationId ) ;